- Description
- Periwinkles have solidly built shells with typically sharp round protuberances. They are found in intertidal locations widely distributed in most parts of the world, and often in swarms on harbor walls and other rocky surfaces. Some, however, live in mangroves. The outer lip of the shell is sharp-edged and thin, while the mollusc has a horny operculum. The species shown here is larger than many (4 cm.) and was found in Japan.
- Interestingly, several families in the superfamily, Littorinoidea, have adapted to heavily muddy water by developing the capacity to breath air directly (see also Pulmonate snails).
- Classification
- Class: Gastropoda
- Clade: Littorinimorpha
- Superfamily: Littorinoidea
- Family: Littorinidae
- Major Genera
- Genus: Cremnoconchus
- Genus: Echininus
- Genus: Haloconcha
- Genus: Littorina
- Genus: Nodilittorina
- Genus: Peasiella
- Genus: Tectarius
Tectarius pagodus (Linnaeus, 1758)
Pagoda Prickly-Winkle